Method for strengthening edge of article, glass, and display apparatus

1. A method for strengthening an edge of an article wherein the article comprises a side surface located at the edge, comprising the steps of:

applying an etching paste at least to the side surface of the article to perform etching so as to strengthen the edge of the article; and

removing the etching paste,

wherein based on the total weight of the etching paste, the etching paste comprises:

5 wt % to 30 wt % of a fluoride;

21 wt % to 41 wt % of a filler;

9 wt % to 29 wt % of an acid;

5 wt % to 25 wt % of a thickener;

1 wt % to 20 wt % of a surfactant;

20 wt % to 40 wt % of a polishing powder; and

10 wt % to 30 wt % of water.

2. The method according to claim 1 , wherein the method further comprises: before applying the etching paste, providing a protective layer on at least one surface adjacent to the side surface of the article.

3. The method according to claim 2 , wherein the method further comprises: before applying the etching paste, stacking a plurality of the articles to form an article stack and providing the protective layer between two adjacent articles in the article stack.

4. The method according to claim 2 , wherein the protective layer comprises at least one of an acid-resistant film, a peelable adhesive, and a separator paper.

5. The method for according to claim 1 , wherein the article comprises a glass plate.

6. The method according to claim 5 , wherein the method further comprises: before applying the etching paste, providing a first protective layer on the upper surface of the glass plate and a second protective layer on the lower surface of the glass plate and maintaining side surfaces of the glass plate to be exposed.

7. The method according to claim 6 , wherein the first protective layer does not cover a first edge area of the upper surface of the glass plate, and the second protective layer does not cover a second edge area of the lower surface of the glass plate.

8. The method according to claim 7 , wherein a first length of the first edge area in a direction vertical to an intersecting line between the upper surface of the glass plate and a side surface of the glass plate is in a range of 0.1 mm-0.5 mm, and a second length of the second edge area in a direction vertical to an intersecting line between the lower surface of the glass plate and a side surface of the glass plate is in a range of 0.1 mm-0.5 mm.

9. The method according to claim 8 , wherein the method further comprises stacking a plurality of the glass plates provided with the protective layers to form a glass plate stack.

10. The method according to claim 9 , wherein the method further comprises: maintaining the glass plate stack by a clamp via an upper surface of the glass plate stack and a lower surface of the glass plate stack, until the etching paste is removed.

11. The method according to claim 5 , wherein applying the etching paste comprise applying the etching paste by using a coating roller.

12. The method according to claim 5 , wherein removing the etching paste comprises removing the etching paste by spraying.

13. The method according to claim 12 , wherein removing the etching paste comprises spraying water having a pressure in a range of 0.3 MPa-0.6 MPa.

14. The method according to claim 5 , wherein the method further comprises removing the protective layer after removing the etching paste.

15. The method according to claim 1 , wherein the fluoride is one or more selected from the group consisting of: hydrofluoric acid, sodium fluoride and ammonium fluoride; the filler is one or more selected from the group consisting of: starch and a surface modified SiO 2 ; the acid is one or more selected from the group consisting of: oxalic acid and acetic acid; the thickener is one or more selected from the group consisting of: starch, silica gel and diatomite; the surfactant is one or more selected from the group consisting of: a sulfate, ethanol and iso-propanol; the polishing powder is one or more selected from the group consisting of: cerium oxide, aluminum oxide and chromium oxide; and the water is deionized water.

16. The method according to claim 15 , wherein an etching depth in a direction vertical to a side surface of the glass plate to be in a range of 10 μm-50 μm.

17. The method according to claim 16 , wherein an etching time is in a range of 30-360 minutes.